Generate many conditions "equalTo" on "fly"

Realm 4.1.

public static Merchant getMerchant(int merchantId) {
        Realm realm = Realm.getDefaultInstance();
        try {
            return realm.where(Merchant.class)
                    .equalTo(Merchant.ID, merchantId)
                    .findFirst();
        } finally {
            realm.close();
        }
}

OK. It’s work fine. But suppose I has map of fields to filter. And I want to iterate all fileds from map “fieldsAndValues” and on “fly” generate many conditions “equalTo” equals to map’s size. Something like this (psedo code):

public static Merchant getMerchant(Map<String, String> fieldsAndValues) {
        Realm realm = Realm.getDefaultInstance();
        try {
return realm.where(Merchant.class)
         .equalTo("fieldName_1", fieldValue_1)
         .equalTo("fieldName_2", fieldValue_2)
         ...
        .equalTo("fieldName_N", fieldValue_N)
         .findFirst();
        } finally {
            realm.close();
        }
}

Is it possible?

[Zhuinden]

I’d probably throw an IllegalArgumentException instead of return null there, but yeah 👍

It works if there is at least 1 more open Realm instance on the thread.

[alexei-28]

Something like this?

public static Merchant getMerchant(Bundle filter) {
        Realm realm = Realm.getDefaultInstance();
        try {
            RealmQuery<Merchant> realmQuery = realm.where(Merchant.class);
            for (String fieldName : filter.keySet()) {
                Object fieldValue = filter.get(fieldName);
                if (fieldValue instanceof Integer) {
                    realmQuery = realmQuery.equalTo(fieldName, (int) fieldValue);
                } else if (fieldValue instanceof Boolean) {
                    realmQuery = realmQuery.equalTo(fieldName, (boolean) fieldValue);
                } else if (fieldValue instanceof String) {
                    realmQuery = realmQuery.equalTo(fieldName, (String) fieldValue);
                } else {
                    Debug.w(TAG, "getMerchant: Unsupport fieldValue's type: " + fieldValue);
                    return null;
                }
            }
            return realmQuery.findFirst();
        } finally {
            realm.close();
        }
    }